evaluating the performance of the buckling restrained braces in tall buildings with peripherally braced frames

In recent years, seismic design of structures has been undergoing significant changes as a result of increasing demand for optimization and minimizing the level of damage and reducing the cost of structural repairs, the development of analytical methods and the remarkable improvements of computer performance have been among the factors which influenced the design of structures. a lot of research has been conducted on the development of better braces with perfect elastoplastic behavior. the inventions and development of buckling restrained braces have been the results of these researches. in this study, the performance of buckling restrained environmental braces (brb) in highrise buildings were evaluated applying nonlinear time-history dynamics analysis with three pairs of acceleration and compared with conventional concentrically braced frame (cbf). the studied structures are 20, 40, and 60 stories building which braces were utilized peripherally. the acquired results reveal that the application of buckling restrained brace frames (brb) instead of conventional braces frame (cbf) in high-rise steel buildings ameliorates hysteresis behavior of the braces and reduces lateral displacements and increase the capacity of base shear as well.